#include <Arduino.h>

int  i;
unsigned int x, y;
float accum, fout, fval = 0.001;    // these are variables for a simple low-pass (smoothing) filter - fval of 1 = no filter - .001 = max filter
long threshold = 0;
const int capR = 4;
const int capS = 3;
const int ledPin = 0;

void setup() {
pinMode (capR, INPUT);
  pinMode (capS, OUTPUT);
  pinMode (ledPin, OUTPUT);
  
  for (short i = 0; i < 10; i++) {
    long max;
    y = 0;
    x = 0;
    for (short i = 0; i < 4; i++) {
      digitalWrite(capS, HIGH);
      while (!digitalRead(capR)) { 
        x++;
      }
      delay(1);

      digitalWrite(capS, LOW);     
      while(digitalRead(capR)) {
        y++;  
      }
      delay(1);
    }
    max = (x > y ? x : y);
    threshold = (threshold > max ? threshold : max);
  } 
}

void loop() { 
 for (short i = 0; i < 4; i++) {
    digitalWrite(capS, HIGH);
    while (digitalRead(capR) == LOW) { 
      x++;
    }
    delay(1); 
    digitalWrite(capS, LOW) ;    
    while (digitalRead(capR) == HIGH) {
      y++;
    }
    delay(1);
    fout =  (fval * (float)x) + ((1-fval) * accum);  
    accum = fout;  
  }

{
  
    digitalWrite(ledPin, HIGH);
 delay(x / 100);
    digitalWrite(ledPin, LOW);
    delay(x / 100);
  } }